stm32iic硬件中断方式通用子函数.doc

/h文件#ifndef _iic_h_#define _iic_h_/* Includes -*/#include stm32f10x.h/* Exported types -*/typedef enum i2c_result NO_ERR = 0, TIMEOUT = 1, BUS_BUSY = 2, SEND_START_ERR = 3, ADDR_MATCH_ERR = 4, ADDR_HEADER_MATCH_ERR = 5, DATA_TIMEOUT = 6, WAIT_COMM = 7, STOP_TIMEOUT = 8I2C_Result;typedef enum i2c_state COMM_DONE = 0, / done successfully COMM_PRE = 1, COMM_IN_PROCESS = 2, CHECK_IN_PROCESS = 3, COMM_EXIT = 4 / exit since failure I2C_STATE;extern I2C_STATE i2c_comm_state;extern vu8 MasterReceptionComplete;extern vu8 MasterTransitionComplete; extern vu8 WriteComplete;extern vu8 SlaveReceptionComplete;extern vu8 SlaveTransitionComplete;void I2C_Comm_Init(I2C_TypeDef* I2Cx, u32 I2C_Speed, u16 I2C_Addr);void I2C_Comm_MasterWrite(I2C_TypeDef* I2Cx, u16 slave_addr, u32 offset, u8* pBuffer, u32 length);void I2C_Comm_SlaveRead(I2C_TypeDef* I2Cx, u8* pBuffer, u32 length);void I2C_Comm_MasterRead(I2C_TypeDef* I2Cx, u16 slave_addr, u32 offset, u8* pBuffer, u32 length);void I2C_Comm_SlaveWrite(I2C_TypeDef* I2Cx, u8* pBuffer, u32 length);void i2c1_evt_isr(void);void i2c1_err_isr(void);void i2c2_evt_isr(void);void i2c2_err_isr(void);/c文件#endif / _iic_h_#include iic.h/* specified by user */#define I2C_REMAP/#define SLAVE_10BIT_ADDRESS/* specify by user */#define Transmitter 0x00#define Receiver 0x01#define FALSE 0#define TRUE 1static vu8 Direction = Transmitter;static u16 SlaveADDR;static u32 TxLength,RxLength;static u32 DeviceOffset=0xffffffff;static u8* pTxBuffer1;static u8* pTxBuffer2;static u8* pRxBuffer1;static u8* pRxBuffer2;static u8 check_begin = FALSE;vu8 MasterReceptionComplete = 0;vu8 MasterTransitionComplete = 0; / to indicat masters send processvu8 SlaveReceptionComplete =0;vu8 SlaveTransitionComplete =0;vu8 WriteComplete = 0; / to indicat targets internal write process/*P-V operation on I2C1 or I2C2*/static vu8 PV_flag_1;static vu8 PV_flag_2;I2C_STATE i2c_comm_state;void I2C_Comm_Init(I2C_TypeDef* I2Cx, u32 I2C_Speed, u16 I2C_Addr)/* GPIO configuration and clock enable */ GPIO_InitTypeDef GPIO_InitStructure; I2C_InitTypeDef I2C_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); if(I2Cx = I2C1) #ifdef I2C_REMAP GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;#else GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;#endif RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); else if (I2Cx = I2C2) GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10| GPIO_Pin_11; RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE); GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD; GPIO_Init(GPIOB, &GPIO_InitStructure); /* I2C periphral configuration */ I2C_DeInit(I2Cx); I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; / fixed I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2; / fixed I2C_InitStructure.I2C_OwnAddress1 = I2C_Addr; / user parameter I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; / fixed#ifdef SLAVE_10BIT_ADDRESS I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_10bit; / user define#else I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;#endif I2C_InitStructure.I2C_ClockSpeed = I2C_Speed; / user parameter I2C_Cmd(I2Cx, ENABLE); I2C_Init(I2Cx, &I2C_InitStructure); /* I2C NVIC configuration */ /* 1 bit for pre-emption priority, 3 bits for subpriority */ /NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);if(I2Cx = I2C1) NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn ; else NVIC_InitStructure.NVIC_IRQChannel = I2C2_EV_IRQn; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); if(I2Cx = I2C1) NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn; else NVIC_InitStructure.NVIC_IRQChannel = I2C2_ER_IRQn; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);/* Function Name : I2C_Comm_MasterWrite* Description : write a block of data to slave devices.* Input : - I2Cx : the I2C port from which mcu send data out.* - slave_addr : target slave* - offset : the internal memory of target slave to place data* if special value : no internal memory space of slave* - pBuffer : pointer to the data ready to send* - length : number of bytes to send.* Output : None* Return : None*/void I2C_Comm_MasterWrite(I2C_TypeDef* I2Cx, u16 slave_addr, u32 offset, u8* pBuffer, u32 length) /* PV operation */ if (I2Cx = I2C1) if (PV_flag_1 !=0) return; PV_flag_1 |=1; if (PV_flag_1 !=1) return; PV_flag_1 = 3; else if (PV_flag_2 !=0) return; PV_flag_2 |=1; if (PV_flag_2 !=1) return; PV_flag_2 = 3; /* enter rountine safely */ /*initialize static parameter*/ Direction = Transmitter; MasterTransitionComplete = 0; /*initialize static parameter according to input parameter*/ SlaveADDR = slave_addr; TxLength = length; DeviceOffset = offset; if (I2Cx = I2C1) pTxBuffer1 = pBuffer; else pTxBuffer2 = pBuffer; /* global state variable i2c_comm_state */ i2c_comm_state = COMM_PRE; I2C_AcknowledgeConfig(I2Cx, ENABLE); I2C_ITConfig(I2Cx, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR, ENABLE); /* Send START condition */ if(I2C1-CR1 & 0x200) I2C1-CR1 &= 0xFDFF; I2C_GenerateSTART(I2Cx, ENABLE);/* Function Name : I2C_Comm_MasterRead* Description : read a block of data from slave devices.* Input : - I2Cx : the I2C port from which mcu send data out.* - slave_addr : target slave* - offset : the internal memory of target slave to place data* if special value : no internal memory space of slave* - pBuffer : pointer to the data ready to send* - length : number of bytes to send.* Output : None* Return : None*/void I2C_Comm_MasterRead(I2C_TypeDef* I2Cx, u16 slave_addr, u32 offset, u8* pBuffer, u32 length) /* PV operation */ if (I2Cx = I2C1) if (PV_flag_1 !=0) return; PV_flag_1 |=1; if (PV_flag_1 !=1) return; PV_flag_1 = 3; else if (PV_flag_2 !=0) return; PV_flag_2 |=1; if (PV_flag_2 !=1) return; PV_flag_2 = 3; /* enter rountine safely */ /*initialize static parameter*/ Direction = Receiver; MasterReceptionComplete = 0; /*initialize static parameter according to input parameter*/ SlaveADDR = slave_addr; RxLength = length; DeviceOffset = offset; if (I2Cx = I2C1) pRxBuffer1 = pBuffer; else pRxBuffer2 = pBuffer; /* global state variable i2c_comm_state */ i2c_comm_state = COMM_PRE; I2C_AcknowledgeConfig(I2Cx, ENABLE); I2C_ITConfig(I2Cx, I2C_IT_EVT | I2C_IT_ERR , ENABLE);/only SB int allowed /* Send START condition */ if(I2C1-CR1 & 0x200) I2C1-CR1 &= 0xFDFF; I2C_GenerateSTART(I2Cx, ENABLE);/* Function Name : I2C_Comm_SlaveRead* Description : receive a block of data from the master.* Input : - I2Cx : the I2C port from which mcu read data in.* - pBuffer : rams location to locate the received data* - length : number of bytes to receive.* Output : None* Return : None*/void I2C_Comm_SlaveRead(I2C_TypeDef* I2Cx, u8* pBuffer, u32 length) /* PV operation */ if (I2Cx = I2C1) if (PV_flag_1 !=0) return; PV_flag_1 |=1; if (PV_flag_1 !=1) return; PV_flag_1 = 3; else if (PV_flag_2 !=0) return; PV_flag_2 |=1; if (PV_flag_2 !=1) return; PV_flag_2 = 3; /* enter rountine safely */ SlaveReceptionComplete = 0; RxLength = length; if (I2Cx = I2C1) pRxBuffer1 = pBuffer; else pRxBuffer2 = pBuffer; /* global state variable i2c_comm_state */ i2c_comm_state = COMM_PRE; I2C_AcknowledgeConfig(I2Cx, ENABLE); I2C_ITConfig(I2Cx, I2C_IT_EVT |I2C_IT_ERR , ENABLE); / ADDR BTF only/* Function Name : I2C_Comm_SlaveWrite* Description : send a block of data out to the master.* Input : - I2Cx : the I2C port from which mcu send data out.* - pBuffer : rams location to locate the data to be send* - length : number of bytes to receive.* Output : None* Return : None*/void I2C_Comm_SlaveWrite(I2C_TypeDef* I2Cx, u8* pBuffer, u32 length) /* PV operation */ if (I2Cx = I2C1) if (PV_flag_1 !=0) return; PV_flag_1 |=1; if (PV_flag_1 !=1) return; PV_flag_1 = 3; else if (PV_flag_2 !=0) return; PV_flag_2 |=1; if (PV_flag_2 !=1) return; PV_flag_2 = 3; /* enter rountine safely */ SlaveTransitionComplete =0; TxLength = length; if (I2Cx = I2C1) pTxBuffer1 = pBuffer; else pTxBuffer2 = pBuffer; /* global state variable i2c_comm_state */ i2c_comm_state = COMM_PRE; I2C_AcknowledgeConfig(I2Cx, ENABLE); I2C_ITConfig(I2Cx, I2C_IT_EVT |I2C_IT_ERR, ENABLE); / ADDR BTF onlyvoid i2c1_evt_isr() switch (I2C_GetLastEvent(I2C1) /* Master Invoke*/ case I2C_EVENT_MASTER_MODE_SELECT: /* EV5 */ / MSL SB BUSY 30001 if(!check_begin) i2c_comm_state = COMM_IN_PROCESS; if (Direction = Receiver) if (DeviceOffset != 0xffffffff) I2C_Send7bitAddress(I2C1, SlaveADDR, I2C_Direction_Transmitter); else /* Send slave Address for read */ I2C_Send7bitAddress(I2C1, SlaveADDR, I2C_Direction_Receiver); else /* Send slave Address for write */ I2C_Send7bitAddress(I2C1, SlaveADDR, I2C_Direction_Transmitter); I2C_ITConfig(I2C1, I2C_IT_BUF , ENABLE);/also TxE int allowed break; /* Master Receiver events */ case I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED: /* EV6 */ / MSL BUSY ADDR 0x30002 if (RxLength = 1) /* Disable I2C1 acknowledgement */ I2C_AcknowledgeConfig(I2C1, DISABLE); /* Send I2C1 STOP Condition */ I2C_GenerateSTOP(I2C1, ENABLE); break; case I2C_EVENT_MASTER_BYTE_RECEIVED: /* EV7 */ / MSL BUSY RXNE 0x30040 /* Store I2C1 received data */ *pRxBuffer1+ = I2C_ReceiveData (I2C1); RxLength-; /* Disable ACK and send I2C1 STOP condition before receiving the last data */ if (RxLength = 1) /* Disable I2C1 acknowledgement */ I2C_AcknowledgeConfig(I2C1, DISABLE); /* Send I2C1 STOP Condition */ I2C_GenerateSTOP(I2C1, ENABLE); if (RxLength = 0) MasterReceptionComplete = 1; i2c_comm_state = COMM_DONE; PV_flag_1 = 0; break; /* Master Transmitter events */ case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED: /* EV8 just after EV6 */ /BUSY, MSL, ADDR, TXE and TRA 0x70082 if (check_begin) check_begin = FALSE; WriteComplete = 1; i2c_comm_state = COMM_DONE; I2C_ITConfig(I2C1, I2C_IT_EVT | I2C_IT_BUF |I2C_IT_ERR, DISABLE); I2C_GenerateSTOP(I2C1, ENABLE); PV_flag_1 = 0; break; if (DeviceOffset != 0xffffffff) I2C_SendData(I2C1, DeviceOffset); else I2C_SendData(I2C1, *pTxBuffer1+); TxLength-; break; case I2C_EVENT_MASTER_BYTE_TRANSMITTING: /* EV8 */ /TRA, BUSY, MSL, TXE 0x70080 if (Direction = Receiver) DeviceOffset = 0xffffffff; / enter read-phase 2 (the same as no memory space) I2C_ITConfig(I2C1, I2C_IT_BUF , DISABLE); while (I2C1-CR1 & 0x200) = 0x200); I2C_GenerateSTART(I2C1, ENABLE); break; if (TxLength 0) I2C_SendData(I2C1, *pTxBuffer1+); TxLength-; /* Disable the I2C_IT_BUF interrupt after sending the last buffer data (last EV8) to no allow a new interrupt with TxE and only BTF could generate it */ else if(TxLength = 0) I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE); I2C_GenerateSTOP(I2C1, ENABLE); break; case I2C_EVENT_MASTER_BYTE_TRANSMITTED: /* EV8-2 */ /TRA, BUSY, MSL, TXE and BTF 0x70084 if (Direction = Transmitter) MasterTransitionComplete = 1; I2C_ITConfig(I2C1, I2C_IT_EVT | I2C_IT_BUF, DISABLE); / enable AF and SB and ADDR interrupt I2C_ITConfig(I2C1, I2C_IT_EVT | I2C_IT_ERR, ENABLE); check_begin = TRUE; i2c_comm_state = CHECK_IN_PROCESS; /while (I2C1-CR1 & 0x200) = 0x200); if(I2C1-CR1 & 0x200) I2C1-CR1 &= 0xFDFF; I2C_GenerateSTART(I2C1, ENABLE); break; else break; /* Slave Transmitter Events */ case I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED: /* EV1 */ /TRA, BUSY, TXE and ADDR 0x60082 i2c_comm_state = COMM_IN_PROCESS; I2C_SendData(I2C1, *pTxBuffer1+); TxLength-; I2C_ITConfig(I2C1, I2C_IT_BUF , ENABLE); / also allow TxE break; case I2C_EVENT_SLAVE_BYTE_TRANSMITTED: /* EV3 */ /TRA, BUSY, TXE and BTF 0x60084 if (TxLength0) I2C_SendData(I2C1, *pTxBuffer1+); TxLength-; break; case 0x60080: / TRA, BUSY,TXE, no BTF / if this case added, above case would never be reached if (TxLength0) I2C_SendData(I2C1, *pTxBuffer1+); TxLength-; if (TxLength =0) SlaveTransitionComplete =1; i2c_comm_state = COMM_DONE; I2C_ITConfig(I2C1, I2C_IT_BUF , DISABLE);/close TxE int I2C_ITConfig(I2C1, I2C_IT_ERR , ENABLE);/to handle AF from master receiver PV_flag_1 = 0; break; /* Slave Receiver Events */ case I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED: /* EV1 */ / BUSY ADDR 0x20002 i2c_comm_state = COMM_IN_PROCESS; I2C_ITConfig(I2C1, I2C_IT_BUF , ENABLE); / also allow RxNE break; case I2C_EVENT_SLAVE_BYTE_RECEIVED: /* EV2 */ / BUSY RxNE 0x20040 *pRxBuffer1+ = I2C_ReceiveData(I2C1); RxLength-; / controled by i2c1 sender if (RxLength = 0) SlaveReceptionComplete = 1; I2C_ITConfig(I2C1, I2C_IT_BUF , DISABLE); / only EVT(STOPF) int I2C_ITConfig(I2C1, I2C_IT_EVT